diff options
| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2022-01-25 17:20:35 +0300 |
|---|---|---|
| committer | Suzuki K Poulose <suzuki.poulose@arm.com> | 2022-03-11 13:06:35 +0300 |
| commit | ac0ba2100298a3e85d9a92924a959b80612144e6 (patch) | |
| tree | 6a0064826f6280d252761640dbc1f51a6b7b55fc /arch | |
| parent | dfd42facf1e4ada021b939b4e19c935dcdd55566 (diff) | |
| download | linux-ac0ba2100298a3e85d9a92924a959b80612144e6.tar.xz | |
coresight: trbe: Work around the ignored system register writes
TRBE implementations affected by Arm erratum #2064142 might fail to write
into certain system registers after the TRBE has been disabled. Under some
conditions after TRBE has been disabled, writes into certain TRBE registers
TRBLIMITR_EL1, TRBPTR_EL1, TRBBASER_EL1, TRBSR_EL1 and TRBTRG_EL1 will be
ignored and not be effected.
Work around this problem in the TRBE driver by executing TSB CSYNC and DSB
just after the trace collection has stopped and before performing a system
register write to one of the affected registers. This just updates the TRBE
driver as required.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Suzuki Poulose <suzuki.poulose@arm.com>
Cc: coresight@lists.linaro.org
Cc: linux-doc@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/1643120437-14352-6-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index cbcd42decb2a..93980bf31e2c 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -806,7 +806,7 @@ config ARM64_ERRATUM_2224489 config ARM64_ERRATUM_2064142 bool "Cortex-A510: 2064142: workaround TRBE register writes while disabled" - depends on COMPILE_TEST # Until the CoreSight TRBE driver changes are in + depends on CORESIGHT_TRBE default y help This option adds the workaround for ARM Cortex-A510 erratum 2064142. |